Add missing description. (#6190)

vivre/style.css

@@ -3,7 +3,7 @@ Theme Name: Vivre
 Theme URI: https://wordpress.com/theme/vivre
 Author: Automattic
 Author URI: https://automattic.com/
-Description:
+Description: Vivre is a bold, opinionated blogging theme, heavily inspired by fashion and lifestyle magazines and websites.
 Requires at least: 5.8
 Tested up to: 6.0
 Requires PHP: 5.7